<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>百度一下，你就知道</title>

</head>
<body>
    <div class = "header">

    </div>
    <div class = "center">

    </div>
    <div class = "bottom">

    </div>

</body>
</html>